XI. MISCELLANEOUS. 439 



the one at the side is the gravity poise. The top of the lamp is movable, and 

 has attached internally a small tin chimney, which assists in promoting a 

 draught and keeping it cool. 



Perpetual Almanack. 



The Royal Institute of " Studii Superiorly Florence. 



1924. Calendarium perpetuum mobile. 



Gust. Schubring, Erfurt. 



1924c. Calendarium Perpetuum Mobile, eight Tables in 

 glazed frame and in a stand. Ch. A. Kesselmeyer, Manchester. 



A perpetual calendar, which gives the solution of any chronological problem 

 during a period of from 10,000 years before to 100,000 years after Christ. The 

 tables, which are still in course of construction, will contain the principles of 

 a " Standard Calendar," as invented by the author, the object of which is to 

 demonstrate the errors and inaccuracies both of the Julian and Gregorian 

 calendars. 



Tab. I. Adjustable universal calendar key. 



Tab. II. Adjustable annual calendar. 



Tab. III. Adjustable astronomical calendar of the northern zone. 



Tab. IV. Table for finding the theoretical epacts. 



Tab. V. Table for finding the epacts to be applied. 



Tab. VI. to VIII. contain : explanations and examples of the Calend 

 Perp. Mob.; adjustable universal calendar; adjustable indicator of dates; 

 adjustable cylindrical indicator of week days; adjustable perpetual pocket 

 calendar; annual pocket calendar for the year 1877; calend of the week 

 days. 



The principal object of this work is to solve all problems connected with 

 chronological calculations, and ultimately to present an improved Calendar in 

 accordance with present astronomical research. The first five tables are 

 completed, the next three, now in the press, are to appear next year, and will 

 then replace the three blank tables now in the frames. The first five tables 

 treat of the Julian, Gregorian, and improved Gregorian Calendars, all calcu- 

 lations being extended over a period from 10,000 years B.C. to 100,000 

 A.D. The subsequent tables VI., VII., VIII. will treat of the Normal 

 Calendar of the Christian Era (Reform of the Calendar), extending 

 over a peiiod from 2,000 B.C. to 3,000 A.D., containing various astronomical 

 data. 



TABLE I. The object of this table is to find the Calendar Number corre- 

 sponding to Easter Sunday (No. 1 standing for the 22nd of March, No. 35 for 

 the 25th of April), the Dominical Letter, Epact, Golden Number, New and 

 Full Moons, &c. for any given year of the Julian, Gregorian, and improved 

 Gregorian Calendars from 10,030 years B.C. to 10,000 years A.D. 



How to use the table. For each century of the above-mentioned eras look 

 for the Dominical Letter, the Golden Number, and the Number (Stellungs- 

 zahl) giving the Cycle of 19 Epacts corresponding to the 19 Golden Numbers 

 to be used during the century, in the catalogue situated under the movable 

 frame, and place the same against these letters and figures, care being also 

 taken to move the seven vertical strips of cardboard so that years either 

 B.C. or A.D. are visible, as the case may require. 



For the Julian Calendar always place the little black square H cor- 

 responding to the Golden Number 1 against Epact 8 or " Stellungszah. " 

 (Number of Cycle of 19 Epacts) 1, and only in case the proper dates of the 

 mean astronomical New and Full Moons are required use the indicated 



