The Dental cosmos . A It will be observed by recurring to Fig. 26 that when the two halvesof the jack are inclosed within the spring, they are firmly preventedfrom rotation by the contact of their flattened sides, but are freeto slide forth and back as indicated by the arrows. In Fig. 29 the device is shown in action as a pushing-jack, and the Fig. 29. peculiar adaptation of the neck-wires for simple security of impinge-ment without disturbance of the gum-margins is apparent. Forgreater security ligatures are of course applicable, and can be addedwithout difficulty. These spring-jacks can be m
The Dental cosmos . A It will be observed by recurring to Fig. 26 that when the two halvesof the jack are inclosed within the spring, they are firmly preventedfrom rotation by the contact of their flattened sides, but are freeto slide forth and back as indicated by the arrows. In Fig. 29 the device is shown in action as a pushing-jack, and the Fig. 29. peculiar adaptation of the neck-wires for simple security of impinge-ment without disturbance of the gum-margins is apparent. Forgreater security ligatures are of course applicable, and can be addedwithout difficulty. These spring-jacks can be made very small and short, and are FIRST DISTRICT DENTAL SOCIETY, STATE OF NEW YORK. 205 therefore readily adaptable to clasps, and cribs, and plates of everykind ; they can even be curved so as to act upon an arc of a circle. With regard to the construction of regulating fixtures, the writerhas at hand for future presentation some simple means and applianceswhich it is believed will prove practically useful. PROCEEDINGS OF DENTAL SOCIETIES, First District Dental Society, State of New York. The First District Dental Society of the State of New York held aregular monthly meeting Tuesday evening, January 13, 1891, in thenew building of the New York Academy of Medicine, No. 17 WestForty-third street. The president, Dr. J. F. P. Hodson, in thechair.
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