Image from page 150 of “Animals of the past, an account of some of the creatures of the ancient world” (1913)

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Image from page 150 of “Animals of the past, an account of some of the creatures of the ancient world” (1913)
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Identifier: cu31924003685645
Title: Animals of the past, an account of some of the creatures of the ancient world
Year: 1913 (1910s)
Authors: Lucas, Frederic A. (Frederic Augustus), 1852-1929
Subjects: Paleontology
Publisher: New York, [American Museum of Natural History]
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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riceratops let us glance fora moment at its skeleton. Now among otherthings a skeleton is the solution of a problemin mechanics, and in Triceratops the head sodominates the rest of the structure that onemight almost imagine the skull was made firstand the body adjusted to it. The great headseems made not only for offence and defence;the spreading frUl serves for the attachmentof muscles to sustain the weight of the skull,while the work of the muscles is made easierby the fact that the frill reaches so far backof the junction of head with neck as to largely THE DINOSAURS 103 counterbalance theweight of the faceand jaws. Whenwe restored theskull of this ani-mal it was foundthat the centre ofgravity lay back ofthe eye. Severalof the bones of theneck are united inone mass to fur-nish a firm attach-ment for the mus-cles that supportand move theskull, but as themovements of theneck are alreadyrestricted by theoverhanging jfrUl,this loss of motionis no additional dis-advantage.To support all

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104 ANIMALS OF THE PAST this weight of skull and body requires verymassive legs, and as the fore legs are veryshort, this enables Triceratops to browse com-fortably from the ground by merely loweringthe front of the head. These forms we have been considering werethe giants of the group, but a commoner spe-cies, Thespesius, though less in bulk than thosejust mentioned, was stiU of goodly proportions,for, as he stalked about, the top of his headwas twelve feet from the ground. Thespesius and his kin seem to have beencomparatively abundant, for they have a widedistribution, and many specimens, some almostperfect, have been discovered in this countryand abroad. No less than twenty-nine Igu-anodons, a European relative of Thespesius,were found in one spot in mining for coal atBernissart, Belgium. Here, during long yearsof Cretaceous time, a river slowly cut its waythrough the coal-bearing strata to a depth of750 feet, a depth almost twice as great asthe deepest part of the gorge of Niagara

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Image from page 528 of “Electric railway journal” (1908)
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Identifier: electricrailway511918newy
Title: Electric railway journal
Year: 1908 (1900s)
Authors:
Subjects: Electric railroads
Publisher: [New York] McGraw Hill Pub. Co
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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ty and reliability and to combinevarious small pieces of apparatus into larger units. In the equipment for surface cars a return has been madeto more general use of the shunting method of transi-tion from series to parallel, instead of using the bridg-ing feature, which required a greater number of con-tacts or switches. These changes are producing lowermaintenance costs and reduced cost for replacementparts. The combining of various pieces of control apparatusand assembling them in a single box, which applies par-ticularly to switch-group control, simplifies the controlconnections, reduces the labor and time of inspectionand provides a lighter equipment. Switch Group of Worlds Biggest Rapid-TransitCar Weighs Only 900 lb. The effort to reduce weight has not been confined tocar bodies, trucks and motors, but has been extended tocontrol equipment in a marked degree. The consolida-tion of various parts comprising an equipment into sin-gle units, just referred to, has produced astonishing

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Skill in the selection of gearing conduces to economy results in weight reduction. In the control equipmentsused by the New York Municipal Railway on their newsubway cars, the switch group which is designed tohandle two 200 hp. motors weighs but 900 lb., scarcelymore than half the weight of the former control outfitof similar capacity. By combining all the main-circuit apparatus in asingle box a further reduction in weight has resulted,due to the decrease in the amount of cable and conduitrequired and in the labor and consequent cost of instal-lation. Another marked saving in weight has been effectedby a special design of grid resistor, whereby the weightof a set has been reduced approximately 40 per centwithout loss in continuous capacity. Not only has the weight of resistors for a givencapacity been decreased by better ventilation and in-creased radiation, but control connections, also, havebeen rearranged so that the same section of resistanceis used several times in increasing the

Green apple snack 24.5.12
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