(a) Leave to Proceed on Appeal In Forma Pauperis From Lower Court to Appellate Court. Either a lower court or a single justice, for cause shown and after reasonable notice, may authorize an appeal to be prosecuted in forma pauperis, upon such reasonable terms as such court or justice may prescribe.

(b) Form of Briefs, Appendices and Other Papers. Parties allowed to proceed in forma pauperis may file briefs, appendices and other papers in typewritten form, and may request that the appeal be heard on the original record without the necessity of reproducing parts thereof in any form.